diff --git a/frontend/src/hooks/useIndicatorSettings.ts b/frontend/src/hooks/useIndicatorSettings.ts
index 5734dc8..5e1f95f 100644
--- a/frontend/src/hooks/useIndicatorSettings.ts
+++ b/frontend/src/hooks/useIndicatorSettings.ts
@@ -22,7 +22,7 @@
  */
 
 import { useEffect, useRef, useCallback, useState } from 'react';
-import { getIndicatorDef, mergePlotDefs, normalizeHLines, PlotDef, HLineDef } from '../utils/indicatorRegistry';
+import { getIndicatorDef, mergePlotDefs, normalizeHLines, normalizeObvParams, PlotDef, HLineDef } from '../utils/indicatorRegistry';
 import { createDefaultSmaParams, createDefaultSmaPlots, normalizeSmaConfig } from '../utils/smaConfig';
 import { normalizeIchimokuConfig, mergeIchimokuPlots } from '../utils/ichimokuConfig';
 import {
@@ -177,6 +177,9 @@ export function useIndicatorSettings(sessionKey = 0) {
       if (type === 'IchimokuCloud') {
         return normalizeIchimokuConfig({ id: '', type: 'IchimokuCloud', params: merged }).params;
       }
+      if (type === 'OBV') {
+        return normalizeObvParams(merged);
+      }
       return merged;
     },
     [settingsRevision],
diff --git a/frontend/src/utils/ChartManager.ts b/frontend/src/utils/ChartManager.ts
index a4e81e5..150e580 100644
--- a/frontend/src/utils/ChartManager.ts
+++ b/frontend/src/utils/ChartManager.ts
@@ -791,7 +791,7 @@ export class ChartManager {
           const showSeriesTitle = pane < 2 && showPriceLabel;
           series = this.chart.addSeries(LineSeries, {
             color:            plotDef.color,
-            lineWidth:        (plotDef.lineWidth ?? 1) as 1 | 2 | 3 | 4,
+            lineWidth:        Math.max(1, plotDef.lineWidth ?? 1) as 1 | 2 | 3 | 4,
             lineStyle:        plotSeriesLineStyle(plotDef.lineStyle),
             priceLineVisible: false,
             lastValueVisible: showPriceLabel,
diff --git a/frontend/src/utils/indicatorRegistry.ts b/frontend/src/utils/indicatorRegistry.ts
index 2a95ee9..35c7a26 100644
--- a/frontend/src/utils/indicatorRegistry.ts
+++ b/frontend/src/utils/indicatorRegistry.ts
@@ -441,6 +441,45 @@ export function mergePlotDefs(saved: PlotDef[] | undefined, defaults: PlotDef[])
   });
 }
 
+/** OBV·CCI·RSI·TRIX — registry 신호선(plot1) 병합·표시 보장 (DB에 plot0만 저장된 경우 대비) */
+const SIGNAL_LINE_INDICATOR_TYPES = new Set(['OBV', 'CCI', 'RSI', 'TRIX']);
+
+function normalizeSignalLineIndicatorPlots(
+  type: string,
+  plots: PlotDef[],
+  registryPlots: PlotDef[],
+  plotVisibility: Record<string, boolean>,
+  params: Record<string, number | string | boolean>,
+): { plots: PlotDef[]; plotVisibility: Record<string, boolean> } {
+  if (!SIGNAL_LINE_INDICATOR_TYPES.has(type)) {
+    return { plots, plotVisibility };
+  }
+  const merged = mergePlotDefs(plots, registryPlots);
+  const regSignal = registryPlots.find(p => p.id === 'plot1');
+  const nextPlots = regSignal
+    ? merged.map(p => {
+      if (p.id !== 'plot1') return p;
+      return {
+        ...regSignal,
+        ...p,
+        id: 'plot1',
+        title: regSignal.title,
+        type: 'line' as const,
+        lineWidth: Math.max(1, p.lineWidth ?? regSignal.lineWidth ?? 1),
+      };
+    })
+    : merged;
+  const nextVis = { ...plotVisibility };
+  if (type === 'OBV') {
+    nextVis.plot1 = true;
+  } else if ((type === 'CCI' || type === 'RSI') && params.maType === 'None') {
+    nextVis.plot1 = false;
+  } else if (nextVis.plot1 !== false) {
+    nextVis.plot1 = true;
+  }
+  return { plots: nextPlots, plotVisibility: nextVis };
+}
+
 /** 업비트 OBV 신호선 MA 종류 (단순·지수·가중만) */
 export const OBV_MA_TYPE_OPTIONS = ['SMA', 'EMA', 'WMA'] as const;
 export type ObvMaType = (typeof OBV_MA_TYPE_OPTIONS)[number];
@@ -520,18 +559,20 @@ export function enrichIndicatorConfig(
   if (cfgNorm.type === 'DMI') {
     params = normalizeDmiParams(params);
   }
-  const plots = cfgNorm.type === 'BollingerBands'
+  let plots = cfgNorm.type === 'BollingerBands'
     ? mergeBbPlots(cfgNorm.plots, def.plots)
     : mergePlotDefs(cfgNorm.plots, def.plots);
-  const plotVisibility: Record<string, boolean> = { ...cfgNorm.plotVisibility };
+  let plotVisibility: Record<string, boolean> = { ...cfgNorm.plotVisibility };
   for (const p of plots) {
     if (plotVisibility[p.id] === undefined) plotVisibility[p.id] = true;
   }
-  if (cfgNorm.type === 'OBV') {
-    plotVisibility.plot1 = plotVisibility.plot1 !== false;
-  } else if ((cfgNorm.type === 'CCI' || cfgNorm.type === 'RSI') && params.maType === 'None') {
-    plotVisibility.plot1 = false;
-  }
+  ({ plots, plotVisibility } = normalizeSignalLineIndicatorPlots(
+    cfgNorm.type,
+    plots,
+    def.plots,
+    plotVisibility,
+    params,
+  ));
 
   const out: import('../types').IndicatorConfig = {
     ...cfgNorm,
@@ -636,6 +677,9 @@ export async function calculateIndicator(
   if (type === 'CCI') {
     calcParams = normalizeCciParams(params);
   }
+  if (type === 'OBV') {
+    calcParams = normalizeObvParams(params);
+  }
   if (type === 'IchimokuCloud') {
     const { senkou } = resolveIchimokuDisplacements(params);
     calcParams = { ...params, displacement: senkou };
diff --git a/frontend/src/utils/strategyToChartIndicators.ts b/frontend/src/utils/strategyToChartIndicators.ts
index 3eb0529..6df925d 100644
--- a/frontend/src/utils/strategyToChartIndicators.ts
+++ b/frontend/src/utils/strategyToChartIndicators.ts
@@ -8,6 +8,8 @@ import {
   enrichIndicatorConfig,
   getIndicatorDef,
   getHLineLabel,
+  mergePlotDefs,
+  normalizeObvParams,
   type HLineDef,
 } from './indicatorRegistry';
 import { buildMainIndicatorConfig } from './indicatorMainConfig';
@@ -199,6 +201,17 @@ function buildOneIndicator(
       plots: mainSma?.plots ?? cfg.plots,
       plotVisibility: mainSma?.plotVisibility ?? cfg.plotVisibility,
     });
+  } else if (ref.registryType === 'OBV') {
+    const p = normalizeObvParams({ ...cfg.params });
+    const signalLen = ref.rightPeriod ?? ref.period;
+    if (signalLen != null && signalLen > 0) {
+      p.maLength = signalLen;
+    }
+    cfg = {
+      ...cfg,
+      params: p,
+      plots: mergePlotDefs(cfg.plots, def.plots),
+    };
   } else if (ref.period != null && ref.period > 0) {
     cfg = {
       ...cfg,